日志框架 
桥接 转调 绑定

日志门面接口 slf4j   jcl(commons-logging)
桥接 绑定
日志实现 log4j jul(java.util.logging) logback

A-to-B.jar   B-to-A.jar 两个桥接器  死循环 stack overflow

https://www.slf4j.org/manual.html

Exception in thread "main" java.lang.StackOverflowError
  at java.util.Hashtable.containsKey(Hashtable.java:306)
  at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:36)
  at org.apache.log4j.LogManager.getLogger(LogManager.java:39)
  at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:73)
  at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:249)
  at org.apache.log4j.Category.(Category.java:53)
  at org.apache.log4j.Logger..(Logger.java:35)
  at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:39)
  at org.apache.log4j.LogManager.getLogger(LogManager.java:39)
  at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:73)
  at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:249)
  at org.apache.log4j.Category..(Category.java:53)
  at org.apache.log4j.Logger..(Logger.java:35)
  at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:39)
  at org.apache.log4j.LogManager.getLogger(LogManager.java:39)
  subsequent lines omitted...
  
  
易导致 死循环的组合

log4j-over-slf4j 和 slf4j-log4j12 

jcl-over-slf4j.jar 和 slf4j-jcl.jar